final panel project power point
TRANSCRIPT
Panel Project
Nick MogerBradley Michael
Robin Cox
Scope and Objectives• Design
• Optimization
• Practice
• Manufacturing
• Testing
Stringer Concepts
• Z-Stringer– Not strong enough
• Witch Hat Stringer– Simple triangular shape
Failure Conditions
• Web bend angle– Stress Cracks
• Area under hat– Most exposed panel
Optimization
• Kept flanges constant– Minimum 1.5x rivet diameter
• Agreed upon 90°web angle– Easy to check
• Adjust height at expense of width– Too high then too wide
Final Design
Flange end to Flange end = 2.3 inFlange end to Flange end = 2.3 in
Height = 0.64 inHeight = 0.64 inWeb Length = 0.9 inWeb Length = 0.9 in
Final Design
• Quantity - 5
• Rivet Spacing – 23/32nds in– 18/32nds in (from the top and bottom)– Shop aid/jig for “perfect” rivets
• Stringer Spacing– bs-s = 0.5 in
– bs-f = 5/32th in
Predicted vs. Reality
• Original dimensions
-Fabrication not possible; stringers too wide
• Didn’t account for possible misalignments
Reasons For Discrepancy• Coding
– Code was not perfect
• Manufacturing– Stringers were not bent to exact measurements
• Plastering– Our biggest problem!
Snap Crackle Pop
Failure Load (lbf) 18,301 19,635 17,731
Percentage Range (%)
22.6 16.9 25.0
Lessons Learned• Scheduling is important
• Measure twice, cut once
• Multiple ways to a solution
• Fear of the Unknown
• Daaaable Check! (Laugh if you get it)
Conclusion
Snap Crackle Pop
Percentage Range (%)
16.8 10.7 19.4
• Design Successful!
Questions?